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NotRelaxedExamples.hs:9:15: error:
• Illegal nested use of type family ‘F1’
in the arguments of the type-family application ‘F1 (F1 Char)’
(Use UndecidableInstances to permit this)
• In the type instance declaration for ‘F1’
NotRelaxedExamples.hs:10:15: error:
• The type-family application ‘F2 [x]’
is no smaller than the LHS of the family instance ‘F2 [x]’
(Use UndecidableInstances to permit this)
• In the type instance declaration for ‘F2’
NotRelaxedExamples.hs:11:15: error:
• The type-family application ‘F3 [Char]’
is no smaller than the LHS of the family instance ‘F3 Bool’
(Use UndecidableInstances to permit this)
• In the type instance declaration for ‘F3’
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